treatment is traditional heating only.Depends on the treatments it has. Without knowing that we can't tell you a price.
I have geological institute colombo certificate which does not state about any treatment though seller told me that traditional heating is possible.Do you trust the vendor that it is heat only and not diffused?
That is actually the question in my mind .It would seem that $300 is the actual price as that is what you actually paid. Whether you could get that back is a different question.